package com.reggie.lotterysystem.service.activitystatus.impl;

import com.reggie.lotterysystem.common.errorcode.ServiceErrorCodeConstants;
import com.reggie.lotterysystem.common.exception.ServiceException;
import com.reggie.lotterysystem.service.ActivityService;
import com.reggie.lotterysystem.service.activitystatus.ActivityStatusManager;
import com.reggie.lotterysystem.service.activitystatus.operator.AbstractActivityOperator;
import com.reggie.lotterysystem.service.dto.ConvertActivityStatusDTO;
import org.bouncycastle.asn1.sec.SECNamedCurves;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;


@Component
public class ActivityStatusManagerImpl implements ActivityStatusManager {

    private final static Logger logger = LoggerFactory.getLogger(ActivityStatusManagerImpl.class);

    @Autowired
    private final Map<String, AbstractActivityOperator> operatorMap = new HashMap<>();
    @Autowired
    private ActivityService activityService;


    @Transactional(rollbackFor = Exception.class)
    @Override
    public void hadlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        //1、活动状态扭转有依赖性，导致代码维护性差
        //2、状态扭转条件可能会扩展，当前写法，扩展性差，维护性差

        if (CollectionUtils.isEmpty(operatorMap)){
            logger.warn("operatorMap 为空！");
            return;
        }
        Map<String, AbstractActivityOperator> currMap = new HashMap<>(operatorMap);
        Boolean update = false;
        //先处理：人员，奖品
        update = processConvertStatus(convertActivityStatusDTO,currMap,1);
        //后处理：活动
        update = processConvertStatus(convertActivityStatusDTO,currMap,2) || update;
        //更新缓存
        if (update){
            activityService.cacheActivity(convertActivityStatusDTO.getActivityId());
        }
    }

    @Override
    public void rollbackHandlerEvent(ConvertActivityStatusDTO convertActivityStatusDTO) {
        //operatorMap：活动、奖品、人员
        //活动是否需要回滚？？绝对需要，
        //原因：奖品都恢复成INIT，那么这个活动下的奖品绝对没抽完
        for (AbstractActivityOperator operator : operatorMap.values()){
            operator.convert(convertActivityStatusDTO);
        }

        //缓存更新
        activityService.cacheActivity(convertActivityStatusDTO.getActivityId());
    }

    /**
     * 扭转状态
     * @param convertActivityStatusDTO
     * @param currMap
     * @param sequence
     * @return
     */
    private Boolean processConvertStatus(ConvertActivityStatusDTO convertActivityStatusDTO,
                                         Map<String, AbstractActivityOperator> currMap,
                                         int sequence) {
        Boolean update = false;
        //遍历 map
        Iterator<Map.Entry<String, AbstractActivityOperator>> iterator = currMap.entrySet().iterator();
        while (iterator.hasNext()){
            AbstractActivityOperator operator = iterator.next().getValue();
            //operator 是否需要转换
            if (operator.sequence() != sequence
                    || !operator.needConvert(convertActivityStatusDTO)){
                continue;
            }

            //需要转换：转换
            if(!operator.convert(convertActivityStatusDTO)){
                logger.error("{}状态转换失败！",operator.getClass().getName());
                throw new ServiceException(ServiceErrorCodeConstants.ACTIVITY_STATUS_CONVERT_ERROR);
            }

            //currMap 删除大当前的 operator
            iterator.remove();
            update = true;
        }
        return update;
    }
}
